diff --git a/pyproject.toml b/pyproject.toml
index d94fc15f..9121f4ce 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -160,7 +160,7 @@ dev = [
 ]
 
 [project.optional-dependencies]
-a2a = ["a2a-sdk[http-server]>=0.3,<0.4"]
+a2a = ["a2a-sdk[http-server]>=0.3,<1.2"]
 a2a-v1 = ["a2a-sdk[http-server]>=1.0.1,<2.0"]
 ag-ui = ["ag-ui-protocol>=0.1.10"]
 strands-agents = [